hi im having the exact same issue I recently purchased the s6 edge 64GB and I am delighted with the looks of the phone. however one feature/aspect of the phone is really annoying me to a point where I am about to return phone
The screen on full brightness during daylight is very nice and bright. however when I go into a dark room or even the toilet the screen itself would just dim down even though the "AUTO" brightness is switched off. so if auto brightness is switched off and the brightness is on manual at full brightness why on earth is the screen still controlling the brightness. I want it to remain the same whether its dark or light. if I want the phone to control the brightness I will put it on auto and allow it to take control. this is extremely annoying. could someone please explain how to fix this. as I have tried every single setting with no success. and is everyone else experience the same issue?